So as a health driven girl without the most stellar of immune systems I always try to be aware of herbs and supplements that can help give it a swift and natural boost. Even with cold and flu season behind us, (or ahead of us, however you choose to see it) those of us with compromised or weakened immune systems can always benefit from these friendly earth offerings.
Echinacea in capsules or tablets -- I even make my own tea! I get high quality echinacea capsules from my naturopath or from a vitamin store and open them up in hot water. To cut back on the bitterness I usually add in a small teaspoon of organic honey.
Taking garlic capsules daily or incorporating fresh garlic in your meals daily is an amazing natural anti-fungal and anti-bacterial. It's especially beneficial to those of us with candida issues as it can help kill it naturally.
You can also use blends such as almond oil (do not use if you have a nut allergy) and lavender, or almond oil and thyme essential oils as a blend to massage on your chest daily for added benefit to keeping your immunue system functioning properly.